It's a great start but needs some work.
There are some very light coloured lines near the back section that stick out.
Also the shadows are very inconsistent, between the front and back parts of the ship - on the back the shadow is going up, on the front it's going down. Maybe just flip the relevant parts to make them all match up if you don't want to redo them by hand.
All ships I have created include custom weapons, graphics etc: